Abstract: Cassette changing apparatus for index-feed machining systems having such a construction that a plurality of machining units, in which cassettes having machining means are provided, are disposed at predetermined intervals in the workpiece feeding direction in accordance with a plurality of machining processes; the cassette changing apparatus comprising a cassette transfer unit adapted to be movable in such a direction as to intersect with the workpiece feeding direction on a plane, and a cassette holder adapted to be approachable to and detachable from an index-feed machining system; a cassette being extracted from the index-feed machining system and housed in the cassette holder by means of the cassette transfer unit, and then another cassette holder housing a new cassette being moved to a loading position and mounted on the machining unit by means of the cassette transfer unit.

Abstract: An index-feed machining system having a pilot machining device for sequentially forming pilot portions on a workpiece indexed at predetermined pitches, a pilot guide means engaging with the pilot portions, and a plurality of independent machining means corresponding to a plurality of machining processes; all of these means being sequentially disposed in the feeding direction of workpiece; in which the pilot machining means and the pilot guide means are constructed integrally. The index-feed machining system lends itself to the easy positioning of machining means, and to the manufacture of high-precision products.

Abstract: An electrode clamp device for use in electrochemical machines for simultaneously holding a plurality of electrodes made of metallic pipes. The clamp device comprises a clamp block having a plurality of electrode inserting through holes and a plurality of blind tapped holes each of which is perpendicular to the corresponding through hole and has a depth such that the bottom surface of the tapped hole is located in a plane containing the central axis of the through hole to provide an electrode receiving groove in the bottom surface of the tapped hole. Each of the electrodes is individually clamped against the electrode receiving groove with an elastic member by means of a set-screw screwed in the tapped hole.

Abstract: A power supply circuit for discharge machining comprising a first switching means for supplying a d-c power voltage to a discharge gap between a discharge machining electrode and a workpiece, a first energy consumption circuit having a second switching means provided on the output side of the first switching means, and a second energy consumption circuit having a third switching means provided in the vicinity of the discharge gap in parallel therewith, in which the second switching means of the first energy consumption circuit and the third switching means of the second energy consumption circuit are caused to conduct after the first switching means is turned off.

Abstract: A method of making a honeycomb die by using an electrode with parallel grooves in an electrical discharge machining process. The parallel grooves in the electrode are formed by a grinding wheel having a reverse tapered shape. The grinding wheel is progressively dressed during cutting of the parallel grooves.

Abstract: A machining control device for discharge machining equipment. The arrangement provides discharge machining equipment such that it may accomplish discharge machining on a workpiece under appropriate machining conditions suited to the progress of machining. Effective and stable discharge machining can be effected by structuring machining conditions, which are converted to control set values for the machining control device, into such a fashion as to continuously shift from a rough machining mode to a precision machining mode as an electrode travels.

Abstract: A discharge machining apparatus adapted to quickly absorb the energy, which has been accumulated by an inductance component during discharge machining, during the non-discharge period. The accumulated energy is absorbed as it is caused to flow as a current in an equivalent resistor having a resistance varying function. With this invention, it becomes possible to increase the frequency of discharges per unit time since the energy is quickly absorbed without residue as the change in the resistance value of the equivalent resistor causes the current flowing in it to shift from an oscillating state to a normal damping state.

Abstract: An extrusion die for extruding ceramic honeycomb structural bodies includes body discharge channels having a desired honeycomb arrangement and independent body supply holes communicating with the body discharge channels. The body supply holes are so designed that each of them has inner peripheral surface zones of different inner dimensions and the inner peripheral surface zones may be coaxially arranged.

Abstract: Dies for extruding honeycomb structures are disclosed, which comprise wear resistant alloy plates, a die base body having a coefficient of thermal expansion different from that of the wear resistant alloy plates, forming channels having a sectional shape conforming to that of honeycomb structural bodies to be extruded and a given depth from a front face of the die toward a rear face thereof, and a plurality of opening holes independently formed from the die near face toward the die front face and communicating with the forming channels. The die base body and the wear resistant alloy plates are bonded together such that the forming channels may communicate with the opening holes. A method for producing such dies is also disclosed, which is characterized in that slits are preliminarily formed in one of machined faces of the die base before the wear resistive alloy plates are bonded to the die base portion, and are located at a predetermined width in an arrangement conforming to the forming channels.

Abstract: Dies for extruding honeycomb structures are disclosed, which comprise wear resistant alloy plates, a die base body having a coefficient of thermal expansion different from that of the wear resistant alloy plates, forming channels having a sectional shape conforming to that of honeycomb structural bodies to be extruded and a given depth from a front face of the die toward a rear face thereof, and a plurality of opening holes indepndently formed from the die rear face toward the die front face and communicating with the forming channels. The die base body and the wear resistant alloy plates are bonded together such that the forming channels may communicate with the opening holes. A method for producing such dies is also disclosed, which is characterized in that slits are preliminarily formed in one of machined faces of the die base before the wear resistive alloy plates are bonded to the die base portion, and are located at a predetermined width in an arrangement conforming to the forming channels.

Abstract: A honeycomb structure forming die has a forming section provided with at least forming channels and a plurality of opening holes. The forming channels have a sectional shape conforming to that of honeycomb structural bodies to be extruded by the die, and have a given depth from a front face of the die toward a rear face thereof. The opening holes are independently formed from the die rear face toward the die front face and communicate with the forming channels. The honeycomb structure forming die is further provided with communicating holes which communicate with the opening holes of the forming section.

Abstract: A wire-cut electrical discharge machining apparatus having upper and lower tables which are disposed on a bed and movable in such directions as to intersect orthogonally with each other, and a wire electrode which is movably stretched so that a workpiece placed on the upper table can be machined by an electrical discharge produced between the electrode and the workpiece, and characterized in that a through hole is provided at least in the upper table, and upper and lower wire guides are provided above and below the through hole respectively, or inside the same, so that the wire electrode can be discharged via the lower wire guide.

Abstract: A discharge machining apparatus adapted to permit the supply of discharge current to be cut off without increasing electrode consumption. Arrangements are made to gradually increase the level of discharge current, rather than maintaining the current level of discharge pulse. By doing so, electrode consumption becomes independent of the pulse width of the discharge pulse, so the discharge current can be cut off immediately after an abnormal state such as short circuiting or an instantaneous interruption of the discharge current occurs, eliminating the danger of deteriorating the quality of the machining surface of a workpiece.

Abstract: An electrical discharge machining apparatus having an electrode and a work table on which a workpiece is placed for machining the workpiece by causing an electric discharge between the electrode and the workpiece. A shielding cover for forming a substantially enclosed predetermined space around main structural members comprising the electrical discharging apparatus is provided. A gas is introduced into the space formed by the shielding cover so as to keep the temperature in the space at a constant level.

Abstract: Ceramic honeycomb structural body-extruding dies are disclosed which each comprise a plurality of die-constituting members. The die-constituting members are bonded together with a bonding layer, and the bonding layer is composed of an acid-resisting metal.

Abstract: An extrusion die having on the front surface thereof a bearing opening of the shape of a given section; a bearing surface corresponding to the section of the bearing opening formed over a length from the front surface to the rear surface of the die; and a draft formed from the bearing surface toward the rear surface; the bearing surface at each position on the inner circumferential line of the bearing opening being formed in such a fashion as to have a bearing length which is substantially determined in accordance with the shape of the bearing opening at that position wherein, when viewed with respect to a sectional face orthogonal to the inner circumferential line, a straight line corresponding to the bearing surface and a straight line corresponding to the draft intersect at a depth position substantially equal to or larger than the bearing length at that position, and the depth position where the intersection point exists is in a depth position which is substantially determined in accordance with the shape

Abstract: Disclosed herein is a die for extruding honeycomb structural body, which comprises a die base body made of an alloy steel and a plate of a wear resistant alloy which is joined to the front face side of the die base body. In the wear resistant alloy plate are formed forming slits having a sectional profile conforming to that of a honeycomb structural body to be shaped and having a given depth from the front face of the die toward the rear face thereof, and a plurality of openings are formed independently of each other in the die base body from the rear face of the die toward the front face thereof to communicate with the forming slits. The wear resistant alloy plate may be joined to the die base body through an alloy steel plate having the same as or thinner than the thickness of the wear resistant alloy plate. A method of manufacturing such a honeycomb structural body-extruding die is also disclosed.

Abstract: A tire manufacturing mold comprising a profile ring having a contour corresponding to the outer profile of a tire being molded, including at least the tread thereof, and a net ring having a faying surface for making contact with the contour surface and consisting of ribs and/or lugs for forming the grooves of the tire being molded. The net ring is disposed on the contour surface of the profile ring. The profile ring and/or the net ring has gas vent members embedded so as to form gas vent gaps on the periphery thereof; and the gas vent gaps formed on the periphery of the gas vent members being constructed as gas vent passages.

Abstract: A die for extruding honeycomb structural bodies includes a plurality of ceramic batch exhaust grooves and a plurality of ceramic batch supply apertures. Tubes are fitted in at least some of the ceramic batch supply apertures to improve or make constant the surface roughness and dimensions of inner surfaces of ceramic batch supply apertures through which the ceramic batch passes, thereby producing perfect ceramic honeycomb stuctural bodies. The adjustment of flow of ceramic batch is so simplified that any other controlling plate which would be required in the prior art is not needed for controlling the flow. When the supply apertures have been worn off, the tubes are exchanged by new ones to restore the required inner surfaces easily.

Abstract: Disclosed herein is a die for extruding honeycomb structural body, which comprises a die base body made of an alloy steel and a plate of a wear resistant alloy which is joined to the front face side of the die base body. In the wear resistant alloy plate are formed forming slits having a sectional profile conforming to that of a honeycomb structural body to be shaped and having a given depth from the front face of the die toward the rear face thereof, and a plurality of openings are formed independently of each other in the die base body from the rear face of the die toward the front face thereof to communicate with the forming slits. The wear resistant alloy plate may be joined to the die base body through an alloy steel plate having the same as or thinner than the thickness of the wear resistant alloy plate. A method of manufacturing such a honeycomb structural body-extruding die is also disclosed.